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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //手机
        function Phone(brand, price){
            this.brand = brand
            this.price = price
        }
        Phone.prototype.call = function(){
            console.log("我可以打电话");
        }

        //声明一个智能手机
        function SmartPhone(brand, price, color, size){

            Phone.call(this, brand, price)

            this.color = color
            this.size = size
        }

        //设置子级构造函数的原型
        SmartPhone.prototype = new Phone
        SmartPhone.prototype.constructor = SmartPhone

        //声明子类的方法
        SmartPhone.prototype.photo = function(){
            console.log("我可以拍照");
        }
        SmartPhone.prototype.playgame = function(){
            console.log("我可以玩游戏");
        }

        const chuizi = new SmartPhone('锤子', 2499, '黑色', '5.5inch')
        console.log(chuizi);
    </script>
</body>
</html>